When I was looking in angrybirdsnest.com finding for updates, Rovio will release many games! Many willcome in this year, but some I think will come in 2015. I got all upcoming apps, these are:
"Epic" Angry Birds game, Angry Birds Stella, Angry Birds Transformers (I think because I red there news round-up), and many more (I think..).
If you got more information, pls comment! :D